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Figure 9


Fig. 9. The LP neuron regulates the speed of the pevkinin-modulated pyloric rhythm. (A) Suppressing LP neuron activity during an ongoing pyloric rhythm in saline did not alter the pyloric cycle frequency. Note that there were five pyloric cycles (six PD neuron bursts) in the same duration regardless of whether the LP neuron was active (pre- and post-LP hyperpolarization) or was silenced (middle) by constant amplitude hyperpolarizing current injection. The pyloric rhythm was unchanged despite the fact that, when LP was silenced, the LP-mediated IPSPs were eliminated in the PD neuron and the trough of the PD neuron slow wave oscillation was depolarized. (B) Suppressing LP neuron activity during an ongoing pyloric rhythm in the presence of PevK-2 increased the pyloric cycle frequency. During the same duration, there were seven pyloric cycles when the LP neuron was active both pre- and post-LP hyperpolarization whereas there were ten pyloric cycles when LP activity was suppressed by hyperpolarizing current injection. Traces in A and B are from the same experiment.





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